const fs = require('fs')
function getFileSize(limit) {
  var size = "";
  if (limit < 0.1 * 1024) {                            //小于0.1KB，则转化成B
    size = limit.toFixed(2) + "B"
  } else if (limit < 0.1 * 1024 * 1024) {            //小于0.1MB，则转化成KB
    size = (limit / 1024).toFixed(2) + "KB"
  } else if (limit < 0.1 * 1024 * 1024 * 1024) {        //小于0.1GB，则转化成MB
    size = (limit / (1024 * 1024)).toFixed(2) + "MB"
  } else {                                            //其他转化成GB
    size = (limit / (1024 * 1024 * 1024)).toFixed(2) + "GB"
  }

  var sizeStr = size + "";                        //转成字符串
  var index = sizeStr.indexOf(".");                    //获取小数点处的索引
  var dou = sizeStr.substr(index + 1, 2)            //获取小数点后两位的值
  if (dou == "00") {                                //判断后两位是否为00，如果是则删除00               
    return sizeStr.substring(0, index) + sizeStr.substr(index + 3, 2)
  }
  return size;
}
class Private {
  constructor() {
  }
  index = async (req, res, next) => {
    const path = 'D:/node_modules/vpackage_versions'
    fs.readdir(path, function (err, files) {
      if (err) {
        res.end();
        return console.log('目录不存在')
      }
      let body = {
        code: '0',
        data: {
          list: files,
          total: files.length
        },
        message: '请求成功'
      }
      res.send(body);
    })
  }
}
module.exports = new Private()    